Effect of temperature
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If the line is horizontal, it is the greek letter theta, often used to label an angle. If the line is diagonal, it is used to denote the diagonal of a circle. As the greek letter phi it is used to denote an empty set and also used to label an angle.
It means that if you do a simple question like 12-4 it equals 8 right? If you were using a label it could be a chocolate bar, donut or really anything. 8 donuts. :)
You label it square if it is a square
The 6th letter of the English alphabet or a failing grade in school.
Just label it with a symbol of your choice and that is its name! Some people prefer a lower case letter but that is not a necessity.